A display panel and a display device are provided. The display panel has an array substrate, a plurality of light-emitting pixel units, a micro lens layer, and a passivation layer. The micro lens layer has a plurality of micro lenses and a plurality of openings. The plurality of openings have a plurality of first openings. In a direction along a plane of the display panel, each of the first openings has a main body portion and at least one expansion portion. The expansion portion is provided at a corner of the main body portion, and the expansion portion is an arc-shaped convex surface, which is beneficial to improve a light concentration effect of micro lenses.